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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
The following table sets forth the computation of basic and diluted earnings per share:
 
Year ended December 31,
Dollar and share amounts in millions, except per share amounts
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
Net income (loss):
 
 
 
 
 
Income (loss) from continuing operations
$
(86.0
)
 
$
(73.4
)
 
$
177.4

Loss from discontinued operations
(2.1
)
 
(2.0
)
 
(0.3
)
Net income (loss)
$
(88.1
)
 
$
(75.4
)
 
$
177.1

Denominator:
 
 
 
 
 
Denominator for basic earnings per share:
 
 
 
 
 
Weighted average common shares outstanding
142.4

 
141.1

 
139.6

Effect of dilutive securities:
 
 
 
 
 
Dilutive effect of employee stock plans
—

 
—

 
2.5

Dilutive effect of stock warrants
—

 
—

 
2.2

Dilutive potential common shares
—

 
—

 
4.7

Denominator for diluted earnings per share:
 
 
 
 
 
Adjusted weighted average shares
142.4

 
141.1

 
144.3

Basic earnings per share:
 
 
 
 
 
Income (loss) from continuing operations
$
(0.60
)
 
$
(0.52
)
 
$
1.27

Loss from discontinued operations
(0.02
)
 
(0.01
)
 
—

Net income (loss) per share
$
(0.62
)
 
$
(0.53
)
 
$
1.27

Diluted earnings per share:
 
 
 
 
 
Income (loss) from continuing operations
$
(0.60
)
 
$
(0.52
)
 
$
1.23

Loss from discontinued operations
(0.02
)
 
(0.01
)
 
—

Net income (loss) per share
$
(0.62
)
 
$
(0.53
)
 
$
1.23